[TASK] Remove unused ViewHelpers from extension manager

Several ViewHelpers inside the extension maanger are not used and
can be removed. As those are not public API no RST file or deprecation
is required.

Resolves: #83937
Releases: master
Change-Id: I0bb551e14062e805ef8b23559bcc22ae32a8e399
Reviewed-on: https://review.typo3.org/55734


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Tobi Kretschmann <tobi@tobishome.de>
Reviewed-by: Sascha Rademacher <sascha.rademacher+typo3@gmail.com>
Reviewed-by: Jan Stockfisch <jan.stockfisch@googlemail.com>
Tested-by: Jan Stockfisch <jan.stockfisch@googlemail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>